Debt and Preferred Equity Investments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Preferred equity investment
Aggregate weighted average current yield (as a percent)	10.69%
Debt and preferred equity investments	$ 1,493,725		$ 1,304,839
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	9.74%
Senior Financing	1,836,493
Debt and preferred equity investments	413,671	[1]	369,364	[1]
Preferred equity with an initial mandatory redemption in July 2015
Preferred equity investment
Senior Financing	525,000	[2]
Debt and preferred equity investments	117,194	[1],[2]	115,198	[1],[2]
Preferred equity with initial mandatory redemption in March 2016
Preferred equity investment
Senior Financing	260,000
Debt and preferred equity investments	40,000	[1]	0	[1]
Preferred equity with initial mandatory redemption in April, 2016
Preferred equity investment
Senior Financing	55,233	[2],[3]
Debt and preferred equity investments	25,912	[1],[2],[3]	25,896	[1],[2],[3]
Preferred equity with initial mandatory redemption in July, 2016
Preferred equity investment
Senior Financing	926,260	[2]
Debt and preferred equity investments	220,622	[1],[2]	218,330	[1],[2]
Preferred equity with initial mandatory redemption in November 2017
Preferred equity investment
Senior Financing	70,000
Debt and preferred equity investments	$ 9,943	[1]	$ 9,940	[1]

[1] Carrying value is net of discounts and deferred origination fees.

[2] The difference between the pay and accrual rates is included as an addition to the principal balance outstanding.

[3] This preferred equity investment was subsequently redeemed in April 2014.